The Zoo Med Turtletherm is preset to heat your turtle's habitat to 25.5°C. The Turtletherm comes with mounts to use on the side or back glass wall of your aquatic turtle’s habitat and include suction cups, digital temp read out and a hard cover. The Turtletherm's are a fully submerge heaterthat need to be in water before plugging the heater into an electrical outlet. It features a Safety shut-off that activates if removed from water. Helps keep aquatic turtles healthy and happy. Helps prevent loss of appetite to cold water temps! Mounts on the side or back glass wall of your aquatic turtle’s habitat with included suction cups. Fully submerge heater in water before plugging the heater into an electrical outlet. Safety shut-off activates if removed from water. 50w TH-50AU Suit aquarium up to 56 Litres (15 gallons) 100w TH-100AU Suit Aquarium up to 113 Litres (30 gallons) Instruction pdf.